I would have cautions about it also. It's one of those items I suspect that you can't know the issues until you have one but I don't think that is going to be unique to anything available?
I remember considering what is now the Borla IDA lookalikes. I got a PM from someone in the UK who said he was a distributor of them and to avoid them.
What he said was pretty much the same thing. You couldn't idle the engine down because the idle screws would stop responding. He thought that was because of the lack of tolerances in the throttle bodies themselves.
I don't know how accurate that is since I stayed away.
I do know that the IDA's in a sense are like that. They stop responding at a certain level. It really is not a lack of close enough tolerances in that case, it's just the limit of the design of the carb and the effect the IR manifold has on them.
Remember those were adapted to American v8's on IR manifolds. Not completely designed from inception for them?
I've never used any of the aftermarket CPU's so I'd have to rely on good advise from previous experiences of similar applications. School of hard knocks teaches you quickly and hopefully you don't repeat the same mistakes again and again?
I'm not necessarily defending or condemning anything made in China. No matter where it is made, you get what you pay for and certainly the Chinese are quite capable of building high quality and high precision pieces. They are also quite adapt at borrowing others technology. I suppose if you borrow something and never pay for it, that is one definition of stealing?
As I mentioned, the Borla's supposedly were having tolerance issues and they were being machined here in the US.
I'd like to actually see the Speedmaster manifolds in person. Looking at those slots they are using for mounting to the heads raises some questions to me?
Nice engine David. How many cubes is it?